CCLS - Math: F.TF.3

Trigonometric Functions
Extend The Domain Of Trigonometric Functions Using The Unit Circle
State Standard:
(+) Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for π–x, π+x, and 2π–x in terms of their values for x, where x is any real number.